Once a week seems like far too often to me, it's barely enough time to absorb and practice anything of any value. Two weeks is better but still a bit of a push. If you are being given a well structured programme then once a month should be enough. A lot of teachers seem to like setting up regular sessions, the most obvious reason is that it provides them with a regular income, this isn't a reflection on the quality of their teaching but I think you need a teacher that you can go to when you need it not when it suits them. Then, as Colin said, you can go at your own rate.